Ka-Ping Yee wrote: > Finally, Phillip brought up PEAK: >> PEAK's uuid module does this such that if win32all is present, >> you get a Windows GUID, or if you have a FreeBSD 5+ or >> NetBSD 2+ kernel you use the local platform uuidgen API. See e.g.: > > ...so i looked at PEAK's getnodeid48() routine and borrowed the > Win32 calls from there, with a comment giving attribution to PEAK. > > Oh, and there is now a test suite that should cover all the code paths. > > This is all posted at http://zesty.ca/python/uuid.py now, > documentation page at http://zesty.ca/python/uuid.html, > tests at http://zesty.ca/python/test_uuid.py .
(From http://zesty.ca/python/uuid.py:) def win32_getnode(): """Get the hardware address on Windows using Win32 extensions.""" try: import pywintypes return int(pywintypes.CreateGuid()[-13:-1], 16) except: pass try: import pythoncom return int(pythoncom.CreateGuid()[-13:-1], 16) except: pass This does not work, for several reasons. 1. (pythoncom|pywintypes).CreateGuid() return a PyIID instance, which you cannot slice: >>> import pywintypes >>> pywintypes.CreateGuid() IID('{4589E547-4CB5-4BCC-A7C3-6E88FAFB4301}') >>> type(pywintypes.CreateGuid()) <type 'PyIID'> >>> pywintypes.CreateGuid()[-13:-1] Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: unsubscriptable object >>> So, you would have to change your code to 'str(pythoncom.CreateGuid())[-13:-1]'. (BTW: Why does it first try pywintypes, the pythoncom?) 2. These functions call to win32 CoCreateGuid function, which create a new uuid. As documented on MSDN, this calls the UuidCreate function which: "The UuidCreate function generates a UUID that cannot be traced to the ethernet/token ring address of the computer on which it was generated." In other words, the last 12 characters do *not* identify the mac address, in fact your function, if repaired, returns a different result each time it is called. See this link for further info: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/rpc/rpc/uuidcreate.asp A possible solution, if you really need the mac address, is to call the UuidCreateSequential function where available (W2k, XP, ...), and UuidCreate on older systems (W98, ME). Link to MSDN: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/rpc/rpc/uuidcreatesequential.asp 3. Now that ctypes is part of Python, why not use it? This snippet of code displays the mac address of one of the ethernet adapters I have in my machine: from ctypes import * import binascii class UUID(Structure): _fields_ = [("Data1", c_ulong), ("Data1", c_ushort), ("Data1", c_ushort), ("Data1", c_ubyte * 8)] def CreateGuid(): uuid = UUID() if 0 == windll.rpcrt4.UuidCreateSequential(byref(uuid)): return str(buffer(uuid)) print binascii.hexlify(CreateGuid()[-6:]) It should be extended to also work on w98 or me, probably. Thomas _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
